Research On Sustainable Urban Residential Area Rainwater Management Based On Low Impact Development(LID)

Under the background of urbanization,the large-scale development and construction of urban residential areas in China has followed.The social economy has also been developing rapidly.People's requirements for the construction of urban residential areas are also upgrading.However,the urban residential area is affected by the natural environment,which makes the process of high-speed development and construction can not be synchronized with it.A large number of environmental problems have been revealed,such as the problem of rain and flood in residential areas,the destruction of the ecological environment,the waste of land resources and so on.Urban residential areas put people's needs in the first place,but ignore the importance of sustainable development,which is not conducive to the long-term development of urban residential areas.In 1980s,the world environment and Development Commission(WCED)proposed the concept of sustainable development in the report "our common future".Later,this concept has been extended in various fields,and the sustainable development has become a key issue that governments have paid attention to.Sustainable development is closely related to many problems arising in the process of urbanization.How to better achieve sustainable development in the process of urbanization has become the focus of attention and research.To solve this problem is of great practical significance.At present,urban construction in China mostly adopts the way of impermeable ground.This method increases the surface rainwater runoff,accelerates runoff speed,reduces rainfall collection time,and decreases the water quality,resulting in negative effects such as heat island effect.In the face of these problems,the way of end treatment is not compatible with the modern urban rain and flood management model.To solve this problem,the concept of low impact development(LID)is introduced in this paper.It is to maintain or restore the natural hydrological mechanism before the regional development as the goal,to reduce the peak flow,reduce the diameter of prolonged rain flow time flow,through the corresponding measures to play a better role in rainwater management.It is starting from the rainwater management point of view,the traditional model will only drain to ignore the way of using water to replace another kind of new stormwater management mode,will use natural circulation drainage and rainwater combined,not only ensures the drainage function but also fully utilize the rainwater resources collected,improve the utilization of water resources,strengthen the ability to control the rain.When encountering extreme weather,it can avoid a lot of life and property losses caused by waterlogging,and also can save water resources and protect the environment.This article from the existing mode of our country,have low impact development for the construction of the new city and the residential area has a guiding significance to the conclusion,and puts forward the future direction of the sustainable development of city construction,describes the operability of the LID technology,points out the economic benefit and ecological benefit and save development costs etc..In the end,the low impact development and transformation of actual cases are carried out in order to achieve the purpose of rainwater management.The results obtained through the transformation of LID is suitable for city development and construction of residential areas and has a good ecological benefits,effectively solve the problem of city rain and flood disasters,to achieve "low impact nature" of natural hydrology in the construction process,to comply with the idea of sustainable development,thus becoming the feasibility in China's philosophy.